Topic: Rafael Nadal

Perspective: The Backhand Boys Two generations ago, tennis stars were good for a sneaker endorsement. Today, they've got the balls for much moreBy Robert Klara

In the early 1970s, long before there were high-tech carbon-fiber tennis racquets and nitrogen-pressured tennis balls to help, Roscoe Tanner pioneered the sudden-death serve. He could send the ball screaming…